摄影诱导的Ag介导的Azaspirocyclic方法包括循环和dearomatization
Ming Li1, Dong-Yu Miao1, Fan Gao1
1Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China.
The Journal of organic chemistry
|November 12, 2024
概括
研究人员开发了一种新的可见光方法来合成阿扎司环化合物. 这种高效的工艺使用易于获得的原始材料在一步内制造复杂的分子,为有机合成提供了有价值的工具.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
背景情况:
- 亚环环化合物是药物化学中的重要结构动图.
- 这些复杂分子的高效合成仍然是一个挑战.
研究的目的:
- 建立一种新的可见光促进的协议,用于阿萨司环合成.
- 开发一种方法,在阿萨司环结构过程中引入基.
主要方法:
- 一个级联反应,涉及自由基的添加,循环和 dearomatization.
- 使用的N-基烯胺和基氧乙酸作为原料.
- 采用可见光作为转换的能量来源.
主要成果:
- 在单个步骤中成功合成了关键的阿扎司环衍生物.
- 已证明具有广泛的基质兼容性和高功能组耐受性.
- 实现了基的有效引入和新键的形成.
结论:
- 开发的协议提供了一条方便而有效的途径,以获得有价值的阿扎司环化合物.
- 这种方法为功能组插入和复杂分子构建提供了强大的策略.
- 可见光促进的方法突出了可持续和有效的合成方法.
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
相关概念视频
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K
01:16Cycloaddition Reactions: Overview
2.5K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.5K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
01:27Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
2.1K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.1K